Date
Sat, 12 Dec 2026
Start
09:00
Venue
Dare Valley Country Park, Aberdare, Rhondda Cynon Taf, Wales
Aberdare, Rhondda Cynon Taf
Countdown
December
A trail marathon loop from Dare Valley with 1,280 m of climbing. Properly hilly, but nine hours is plenty of time if you pace it sensibly.
Key facts
019-hour limit, and all courses close at 18:00
02Minimum age 18
03Circular course, so you finish where you started
Create a free training plan for the Celtic Trail Races 42 km
7-day free trial, no card required
The course
The route
Aberdare
Distance42km
Total climb1,280m
StartElevation
0 kmDrag map to rotate41.8 km
Weather
Mid-December, Aberdare
9°CTypical high
6°CTypical low
-2°CColdest in 20 years
63%Days with rain
Highs around 9°C and lows around 6°C, but it has dropped to -2°C. Rain on 63% of days. Pack for the cold end, not the average.
NASA POWER data, 2006-2025, the week either side of race day
2025 results
Who finishes, and how
#RiderTimeAvg speed
01Katie Beecher04:02:3410.3 km/h
02Ilona Bull05:01:358.3 km/h
03Cara Perfrement05:03:438.3 km/h
28
Women finishers
5:48:09
Median time
7.2 km/h
Median speed
Women · 2025 results, as published by the organiser.
How fast could you finish?
Get a prediction based on your recent training
Organiser
Training
Training for the Celtic Trail Races 42 km
We don't do generic plans. We combine deep knowledge of this race's demands with your recent training, then build a plan with you that progresses as you do.
Beina integrates directly with your existing tools to understand your current fitness, and synchronise your planned sessions.
Intervals.icuWhat a Celtic Trail Races 42 km plan targets
Typical sessions
42 km with 1,280 m of climbing
Time on feet and fatigue resistance
Fuelling and pacing for the whole event
What your weeks look like
Typical sessions
Long runs that build time on your feet
Tempo and threshold sessions to hold race pace
Back-to-back weekend runs for fatigue resistance
Not a generic schedule
Typical sessions
Built from your current fitness and the time you actually have
Adapts every week as Beina learns how you respond
Syncs your sessions straight to Garmin and Wahoo
One clear next session, never a wall of spreadsheet
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Get your Celtic Trail Races 42 km plan.
7-day free trial, no card required.
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